How do we know we can trust the historical surface temperature record? Did global warming stop in 1998? What actions can businesses or individuals take to reduce climate chagne from greenhouse gas emissions? Get asnwers to these and other frequently asked questions.

Much of the western and southern central United States could be in for a warmer-than-average winter this year, while the upper Midwest and Florida peninsula could experience colder-than-average temperatures. Most of California and western Nevada could experience well-below-normal precipitation, while parts of the southeast could receive well-above-normal precipitation.

It is virtually certain our world will continue to warm over this century and beyond. The exact amount of warming that will occur in the coming century depends largely on the energy choices that we make now and in the next few decades.

We can have record-setting blizzards and global warming at the same time. NOAA scientists explain climate variability, how it influenced our weather this winter, and how it differs from climate change.

The Sun is the main source of power for the Earth's climate machine. Space-based measurements, begun in 1978, indicate Earth receives an average of 1,361 W/m<sup>2</sup> of incoming sunlight, and the amount varies by about one-tenth of a percent over the course of the 11-year solar cycle.